public void DestroyByFlood()
{
var area = GetArea();
var field = new CityField(area);
while (true)
{
Boolean wasFlood = false;
for (Int32 x = area.Left; x < area.Left + area.Width; x++)
{
for (Int32 y = area.Y - area.Height; y < area.Y; y++)
{
if (field[x, y])
{
continue;
}
if (field.CanFill(x, y, Walls))
{
field.FillCell(x, y);
wasFlood = true;
}
}
}
if (!wasFlood)
{
var walls = FindAllFloodedWalls(field);
if (walls == null || walls.Count == 0)
{
return;
}
var nodes = walls.GetAllNodes().ToList();
var nodeInfoList = new NodeInfoList(nodes.Select(n => new NodeInfo(n, walls)));
var wallsOfEnclosedSpace = nodeInfoList.FindWallsOfEnclosedSpace().ToList();
if (wallsOfEnclosedSpace.Count == 0)
{
return;
}
wallsOfEnclosedSpace.ForEach(w => Walls.Remove(w));
}
}
}
private Walls FindAllFloodedWalls(CityField field) => new Walls(Walls.FindAll(wall => field.IsFlooded(wall)));